Stool



FIG. 1 is a perspective view of a chair showing my new design;

FIG. 2 is a front elevation at view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a side view thereof, the opposite side view being a mirror image thereof;

FIG. 5 a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a “stool”, as shown and described. 